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All Journal Jurnal Ilmu Pertanian VALENSI CHEMISTRY PROGRESS Jurnal Sains Dasar Alchemy : Journal of Chemistry Jurnal Ilmu Kimia Universitas Brawijaya The Indonesian Green Technology Journal Natural B The Journal of Pure and Applied Chemistry Research Program Kreativitas Mahasiswa - Penelitian Majalah Kesehatan FKUB Indonesian Journal of Chemistry Jurnal Saintek Lahan Kering Molekul: Jurnal Ilmiah Kimia jurnal Ilmu Pertanian (Agricultural Science) JKPK (Jurnal Kimia dan Pendidikan Kimia) Jurnal Muara Sains, Teknologi, Kedokteran dan Ilmu Kesehatan Bubungan Tinggi: Jurnal Pengabdian Masyarakat Jurnal Ilmiah Berkala: Sains dan Terapan Kimia Makara Journal of Science al Kimiya : Jurnal Ilmu Kimia dan Terapan

Hermin Sulistyarti

Brawijaya University

Author-ID : 391367

Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Earth & Planetary Sciences Education Energy Environmental Science Materials Science & Nanotechnology Medicine & Pharmacology Public Health Social Sciences Other

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Development of Spectrophotometry Method For Iodide Determination Based on I2-Starch Complex Formation with Hypochlorite as oxidator Qurrata Ayun; Hermin Sulistyarti; Atikah Atikah
The Journal of Pure and Applied Chemistry Research Vol 4, No 2 (2015)
Publisher : Chemistry Department, The University of Brawijaya

Iodine is one of the most important elements for human body. Both, the overage and the deficiency supply of iodine give negative impact for human health. In this research, a simple and inexpensive spectrophotometric method is developed is based on starch-iodine complex formation, where iodide was oxidized with hypochlorite to form iodine, which then reacted with starch to form a blue starch-iodine complex. In this research, the common analytical parameters were optimized regarding to sensitivity and selectivity. It was noted that maximum wavelength for starch-iodine complex was 618 nm, optimum time for complex formation and oxidation was 15 minutes, and optimum hypochlorite concentration was 6 ppm. Under the obtained optimum conditions, the proposed method showed linearity from 0-20 ppm iodide (r2 = 0.994), with limit detection of 0.20 ppm. Determination of iodide with this method was unaffected by Cl-, and Br-; but SCN- affected the measurement of iodide at concentration of 1 ppm. Application to synthetic and urinary samples showed that the proposed method has good agreement with the standard spectrophotometry (leuco crystal violet method), and can be used as an alternative method for iodide measurement.

Construction and Characterization of Coated Wire Oxalate Ion Selective Electrode Based on Chitosan Zuri Rismiarti; Atikah Atikah; Hermin Sulistyarti
The Journal of Pure and Applied Chemistry Research Vol 3, No 1 (2014)
Publisher : Chemistry Department, The University of Brawijaya

PVC (polyvinyl chloride) membrane based coated wire oxalate ion selective electrode has been developed by using chitosan. The results showed the optimum composition of the membrane was chitosan: aliquat 336: PVC: DBP = 4:1:33:62 (% weight). The electrode showed Nernstian response, Nernst factor 29.90 mV/decade of concentration, linier concentration range of 1x10-5 - 1x10-1 M, detection limit of 2.56 x10-6 M, response time of 30 second, and life time of 42 days. ISE’s performance worked well in pH range of 5-7 and temperature of 25-50 oC. Validation test showed no significant difference (t test) with the SSA method so that the potentiometric method could be used as an alternative method for determining urinary oxalate.

Optimization of Flow Injection (FI) – Spectrophotometry for Hydroquinone Analysis Muhammad Iqbal Fahmi; Hermin Sulistyarti; Ani Mulyasuryani; Adam Wiryawan
The Journal of Pure and Applied Chemistry Research Vol 8, No 1 (2019): Edition January-April 2019
Publisher : Chemistry Department, The University of Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.jpacr.2019.008.01.445

Hydroquinone is one of the phenolic compounds used in various cosmetic products for skin lightening as it can inhibit tyrosinase enzyme in producing melanin. However, hydroquinone is classified as a toxic compound, therefore, several countries such as Africa, Canada, and Indonesia prohibits hydroquinone usage in cosmetics. This research was focused on the development of a method for hydroquinone analysis using flow injection (FI) combined with spectrophotometry based on the reaction of hydroquinone with phloroglucinol in alkaline condition producing orange complex detected at 493 nm. The FI method was optimized based on operational factors and chemical factors in order to achieve sensitivity. The maximum sensitivity of FI method was achieved under operational condition of 100 μL sample volume, 100 cm mixing coil 1, 50 cm mixing coil 2 and 2.8 mL/min with the chemical condition of 0.005 mol/L NaOH and 0.001 mol/L phloroglucinol. Under these optimum conditions, the proposed method showed linearity in the range concentration of 2 – 80 mg/L and the method was applied to cosmetic sample with acceptable recovery

Simple and Rapid Device for Mercury Detection Based on The Formation of Mercury(II)-Dithizonate on Polytetrafluoroethylene (PTFE) Membrane Hermin Sulistyarti; Mega Madha Wijaya; Dewi Setyowati; Sutrisno Sutrisno; Erwin Sulistyo
The Journal of Pure and Applied Chemistry Research Vol 8, No 2 (2019): Edition May-August 2019
Publisher : Chemistry Department, The University of Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.jpacr.2019.008.02.473

A new analytical device for mercury detection has been developed by doping dithizone on to hydrophobic PTFE (polytetrafluoroethylene) membrane to form a blue dithizone membrane which instantaneously changed to orange color of mercury(II)-dithizonate complex, when this dithizone membrane was contacted to mercury(II) solution. The higher concentration of mercury showed the greater intensity of the orange colour mercury(II)-dithizonate complex. The design and chemicals were optimized to obtain the best performance for mercury measurement. This method is prospective as mercury test kit for simple, low cost, and rapid semi-quantitative method for mercury(II) determination from 1-10 mgL-1 suits for on-site mercury detection and has been applied to cosmetics with satisfactory results.

The Coated-Wire Ion Selective Electrode (CWISE) of Chromate Using PVC-Membrane Based on Chitosan as A Carrier Dedeh Kurniasih; Atikah Atikah; Hermin Sulistyarti
The Journal of Pure and Applied Chemistry Research Vol 1, No 1 (2012)
Publisher : Chemistry Department, The University of Brawijaya

A coated-wire ion selective electrode (CWISE) based on chitosan as a carrier for detection of chromate, was developed. CWISE has easy measurement for field analysis, good selectivity and sensitivity. The CWISE’s membrane consist of mixture an active material of chitosan, aliquat 336-chromate, polyvinylchloride (PVC) and dioctylphtalate (DOP) as plasticizer = 4:0.5:35:60.5 (% w/w) dissolved in tetrahydrofuran (THF) solvent (1:3 w/v). The electrode exhibited a good Nernstian slope of 29.77±0.03 mV/decade and a linear concentration range from 10-6 to 10-1 M for chromate. The limit of detection was 1.862 x 10-6 M. It had response time of 20 – 40 sec, and could be used for 49 days. This chromate selective-electrode was found more selective towards the chromate ion than other anions, useable in pH range of 5.0 – 9.0 and temperature of 20 – 50 oC. It was applied as an electrode for direct determination of chromate in water samples and their result compared to standard spectrophotometric method.

Study of Ascorbic Acid as Iron(III) Reducing Agent for Spectrophotometric Iron Speciation Antesar Elmagirbi; Hermin Sulistyarti; Atikah Atikah
The Journal of Pure and Applied Chemistry Research Vol 1, No 1 (2012)
Publisher : Chemistry Department, The University of Brawijaya

The study of ascorbic acid as a reducing agent for iron(III) has been investigated in order to obtain an alternative carcinogenic reducing agent, hydroxylamine, used in spectrophotometric standard method based on the formation of a red-orange complex of Fe(II)-o-phenanthroline. The study was optimised with regards to ascorbic acid concentration as well as pH solution. The results showed that ascorbic acid showed maximum capacity as reducing agent of iron(III) under concentration of 4.46.10-4 M and pH solution of 1-4.Under these conditions, ascorbic acid reduced iron(III) proportionally and performed similarly to that of hydroxylamine. The method gave result to linear calibration over the range of 0.2-2 mg/L withhigh accuracy of 97 % and relative standard deviation of less than 2 %. This method was successfully applied to assay iron speciation in water samples.

Development of Spectrophotometric Method for Determination of Chromium Species Using Hypochlorite Agent Based on the Formation of Cr(VI)-Diphenylcarbazide Complex Lilik Suryati; Hermin Sulistyarti; Atikah Atikah
The Journal of Pure and Applied Chemistry Research Vol 4, No 1 (2015)
Publisher : Chemistry Department, The University of Brawijaya

Research of speciation analysis Cr(III) and Cr(VI) using hypochlorite and peroxide oxidants with Visible Spectrophotometry has been proposed. This research was carried to obtain optimum conditions of oxidation process Cr(III) into Cr(VI) and the formation of Cr(VI)-Diphenylcarbazide complex to the wavelength, complexing time, oxidizing agent (oxidant) concentration, oxidation temperature, pH, and the influence of foreign ion, so it can be proposed as an alternative method for speciation analysis of Cr(III) and Cr(VI). Optimization results show that the maximum wavelength of Cr(VI)-diphenylcarbazide complex is 542 nm by the stable complex time 16-30 minutes using a hypochlorite (HOCl) oxidant concentration 1 x 10-3 M, temperature 60 oC and pH 1. This method is compared with standard method. The presently developed method is more simple and faster than standard method. Regarding accuracy and precision, the method is quite comparable with the standard methods.Key words: speciation, Cr(III), Cr(VI), oxidant, hypochlorite, spectrophotometry VIS

Flow Injection–Indirect Spectrophotometry for Hydroquinone Analysis Based on the Formation of Iron(II)-Phenanthroline Complex Mariam Mohamed Omar Alshibani; Hermin Sulistyarti; Akhmad Sabarudin
The Journal of Pure and Applied Chemistry Research Vol 8, No 3 (2019): Edition September-December 2019
Publisher : Chemistry Department, The University of Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.jpacr.2019.008.03.478

Hydroquinone is an organic antioxidant widely used for skin lightening products which can cause negative impact in excessive use. This study is focused on the development of fast method for the determination of hydroquinone using flow injection-indirect spectrophotometry based on the formation of red complex Iron(II)-phenanthroline. In this method, hydroquinone reduced iron(III) to iron(II) which in the presence of phenanthroline formed Iron(II)-phenanthroline complex detected at maximum wavelength of 510 nm. The common operational and chemical conditions were optimized and the effect of several interfering compounds was also studied to achieve the highest sensitivity with acceptable analysis time. The optimum method performance was obtained under the conditions of 100 µL sample volume, 50 cm mixing coil-1and 75 cm mixing coil-2, 5 ml/min flow rate, 100 mgL-1 Iron(III) concentration, and 0.15 % phenanthroline. Under these conditions the proposed FI-spectrophotometry gave results to linear calibration over the concentration range from 2-100 mgL-1 (y = 0.028x and R2 of 0.999). The method was not interfered in the presence of vitamin C 1 mgL-1 and resorcinol up to 10 mgL-1. However, the higher concentration of vitamin C ³10 ppm and resorcinol ³ 20 ppm gave significant error of measurements. Method validation using standard additions gave results to average recovery value of 97.02 %, which indicates that the FI-spectrophotometry method can be used as an alternative method for determining hydroquinone in cosmetic. Key words: Hydroquinone, flow injection, spectrophotometry, iron, phenanthroline.

Liquid Chromatography for Analysis of Metformin in Myrmeleon sp. Afidatul Muadifah; Hermin Sulistyarti; Sasangka Prasetyawan
The Journal of Pure and Applied Chemistry Research Vol 6, No 3 (2017): Edition of September - December 2017
Publisher : Chemistry Department, The University of Brawijaya

Myrmeleon sp is a typical of insect larva which has been used in Indonesia for diabetes treatment. However, there is no sufficient scientific report explaining the bioactive compounds in this insect. Based on our preliminary research, this insect contained metformin, i.e. one of bioactive compounds for the treatment of type-2 diabetes. Therefore, this study is focused on the development of separation technique using high performance liquid chromatography (HPLC) on a reverse phase C-18 column with UV detection to identify and quantify metformin in methanol extract of Myrmeleon sp. Several parameters of HPLC method were optimized with respect to high resolution of separation and accurate determination of metformin. Satisfied separation was obtained under gradient elution mode using aqueous methanol mobile phase varied from 50-90 % of methanol with flow rate of 0.5 mL/min and detection wavelength of 233 nm. The method performed total separation for all compounds in less than 11 minutes. Spiking technique was chosen for metformin identification and quantitation. Metformin in extract Myrmeleon sp was eluted at retention time (tR) of 4.095 minutes, similarly with retention time of standard metformin of 4.092 minutes. The quantity of metformin in Myrmeleon sp can be simply determined by comparing the additional area of standard metformin with area of metformin from extract Myrmeleon sp. The results confirmed that methanol extract of Myrmeleon sp contained anti-diabetes compound of metformin of 0.58 mg/g Myrmeleon sp larvae with acceptable coefficient variation of 5.56 %.

Characterization of the Curcuminoids Fingerprint Profile in Curcuma and Zingiber Genera by TLC – Digital Image Analysis Anisa Lailatusy Syarifah; Rurini Retnowati; Hermin Sulistyarti
The Journal of Pure and Applied Chemistry Research Vol 8, No 2 (2019): Edition May-August 2019
Publisher : Chemistry Department, The University of Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.jpacr.2019.008.02.462

Curcuma longa, C. xanthorrhiza, C. heyneana, and Zingiber cassumunar contain high curcuminoid and have relatively the similar yellow color. Therefore, that they are potentially adulterated and difficult to differentiate in the form of powder. Hence, it is necessary to characterize the fingerprints compound profile by a simple and rapid method. This research aims to determine fingerprint compound profile of curcuminoid using Thin Layer Chromatography (TLC) and digital image analysis. The result of the research identified that the fingerprint compound profile of curcuminoid on the four rhizomes was obtained by TLC method using silica gel 60 GF254 as the stationary phase, chloroform:dichloromethane:methanol (13:6:1) as the mobile phase, and observation under UV 254 nm light and citroborate reagent. Thereafter, the digital image analysis was carried out using Image J software according to the gray value and % of RGB (red-green-blue) value. Based on gray value and % of RGB, both Curcuma and Zingiber genera were differentiated through curcumin compound (Rf 0.63), demethoxycurcumin (Rf 0.34), bisdemethoxycurcumin (Rf 0.21). The profile of fingerprint compound on Curcuma longa, C. xanthorrhiza, C. heyneana, and Zingiber cassumunar was differentiated through Rf 0.26; Rf 0.17; and Rf 0.10.

Co-Authors 'Aisy, Kamila Rohadatul Abdjan, Muhammad Ikhlas Abdul Malik Bahrudin Abner Tonu Lema Adam Wiryawan Afidatul Muadifah Ahmad Luthfi Fahmi Akhmad Sabarudin Akhmad Sabarudin Akhmad Sabarudin Akhmad Sabarudin Akhmad Sabarudin Ani Mulyasuryani Antesar Elmagirbi Aprilia Nur Tasfiyati Asdauna Zahrotun Nisa Asdauna, Asnaili Alfi Nurillah Atikah Atikah Atikah Atikah Atikah Atikah Atikah Atikah Atikah Atikah Atikah Atikah Atikah Atikah Atikah, Atikah, atikah Aulani`am Aulani`am Aulanni`am, Aulanni`am Balqis Milda, Balqis Barlah Rumhayati Bheta Sari D, Bheta Sari Chanif Mahdi Chanif Mahdi Dedeh Kurniasih Dedeh Kurniasih Dewi Annisa’ Dewi Setyowati Dewi Umaningrum Diana Candra Dewi Eka Ratri Noor Wulandari Elvian Eka Krisnaniningrum Erliana Ginting Erwin Sulistyo Erwin Sulistyo Fahmi, Ahmad Luthfi Fahrana Salas Trenggamayu Nelgi Febriyanti, Sita Gunawan, David Herman Tolle Hikmanita Lisan Nashukha Hilda Emilia Fahriyani, Hilda Emilia Ika Oktavia Wulandari Imam Riva’i Indriana, Silvi Avianti Kamila Rohadatul ‘Aisy Khanifah, Nurul Krisna Rendi Awalludin Kusumaningtyas, Nadia Mira Kusumawardhani, Nury Lale B Rahayu Lilik Suryati Luluil Maknun Mariam Mohamed Omar Alshibani Mega Madha Wijaya Mike Nur Izzati Mochammad Imron Awalludin Mufidah Sari, Puspita Muhammad Iqbal Fahmi Noerma Juli Azhari Novy Lailatuz Zulfah Nury Kusumawardhani Palupi, Endah Sekar Puspitaloka, Paradhita Ayu Putra, Bhurman Pratama Putra, Boyfannie Ivan Putra, Chairil Anjasmara Robo Putri Dini Putri, Krista Firdaus Suwarno Putri, Lani Artana Qonitah Fardiyah Qonitah Fardiyah Qurrata Ayun Rizal Nur Huda RR. Ella Evrita Hestiandari Rurini Retnowati Rurini Retnowati Sasangka Prasetyawan Silvi Avianti Indriana Sita Febrianti Spas D. Kolev Stephanie Lim Sutrisno Sutrisno Syarifah, Anisa Lailatusy Tea, Marselina Theresia Djue Tuti Kurniati Tuti Kurniati Yudha Ikoma Istanti Yulia Dwi Cahyani, Yulia Dwi Zulfah, Novy Lailatuz Zuri Rismiarti

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